1. How many protons, electrons and neutrons are in an atom of 9 4Be ?
- a. 4 protons, 5 electrons, and 9 neutrons
- b. 4 protons, 4 electrons, and 5 neutrons
- c. 9 protons, 9 electrons, and 4 neutrons
- d. 5 protons, 4 electrons, and 4neutrons
- e. 6 protons, 5 electrons, and 5 neutrons
2. Two Isotopes have the:
- a. same proton number
- b. same electron number
- c. same neutron number
- d. none of the above
3. Which of the following properties is NOT a characteristic of the Group 1A(1) elements (alkali metals)?
- a. They are shiny.
- b. They are good conductors of heat.
- c. They react vigorously with water.
- d. Most of them are liquids at room temperature.
- e. They are good conductors of electricity.
4. Which compound contains a polar covalent bond?
- a. NaCl
- b. Cl2
- c. H2
- d. HCl
5. The correct electron dot structure for ammonia, NH3, is:
- a. I
- b. II
- c. III
- d. IV
6. Which of the following measurements has three significant figures?
- a. 0.005 m
- b. 510 m
- c. 5.10 x 10-1 m
- d. 5.1 x 10-2 m
- e. 5100 m
7. If a block of wood has a mass of 1.326 kg, what is its mass in milligrams?
- a. 1.326 x 10-6 mg
- b. 0.1326 mg
- c. 1.326 x 103 mg
- d. 1.326 x 106 mg
8. Which is a physical change?
- a. Steam is condensed to water.
- b. Water is decomposed by an electric current.
- c. Iron rusts in air.
- d. A piece of paper is burned.
9. How many moles is 10. g of calcium carbonate, CaCO3?
- a. 0.010 mol
- b. 0.10 mol
- c. 1.0 mol
- d. 10. mol
10. A sample of gas with a volume of 2.0 L exerts a pressure of 1.0 atm. If the volume is changed to 1.0 L (at constant temperature), what is the pressure?
- a. 0.5 atm
- b. 1.0 atm
- c. 2.0 atm
- d. 4.0 atm
11. Calculate the molarity of a solution prepared by diluting 200.0 mL of 4.0 M HCl to 500.0 mL of solution
- a. 1.1 M
- b. 1.6 M
- c. 2.7 M
- d. 10. M
12. Which represents an acid solution at 25°C?
- a. pH = 7
- b. pH = 3
- c. [OH-] = 1.8 x 10-7
- d. [H3O+] = 6.7 x 10-8
13. The function of a buffer is to
- a. change color at the end point of a titration.
- b. maintain the pH of a solution.
- c. be a strong base.
- d. maintain a neutral pH.
- e. act as a strong acid.
16. A hydrocarbon containing one double bond per molecule is called a(n) ____.
- a. alkene
- b. alkyne
- c. alkane
- d. cyclic hydrocarbon
- e. saturated hydrocarbon
17. Curcumin is a compound found in tumeric. What functional group is not present in curcumin?
- a. phenol
- b. aldehyde
- c. ether
- d. ketone
18. Oxidation of which type of biomolecule provides the greatest energy per gram?
- a. protein
- b. lipid
- c. carbohydrate
- d. nucleic acid
19. Mammals can digest starch but not cellulose because starch
- a. has alpha (1 -> 4) linkages joining glucose units, whereas cellulose has beta (1 -> 4) linkages.
- b. is a poly-glucose, whereas cellulose is a poly-galactose.
- c. is a carbohydrate, but cellulose is a protein.
- d. is made by mammals, but cellulose is made by plants.
20. A difference between RNA and DNA is that:
- a. RNA contains deoxyribose and DNA contains ribose.
- b. RNA contains cytosine and DNA contains uracil.
- c. RNA contains uracil and DNA contains thymine
- d. RNA has a double helix and DNA has a single strand